Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you find the key in the picture below?

A very interesting trivia question for all.

Why do men's shirts have their buttons on the right side and women's have buttons on the left-hand side?

What month of the year has 28 days?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you decipher the below rebus?

PBLUESAISNUERSES

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?